Efficiency adjusting factor
Collectors |
Efficiency
calculation |
Optical efficiency n0 |
1st ORDER heat loss a1 |
2nd ORDER heat loss a2 |
Temp difference Tm-Ta |
Solar Irradiance G |
Efficiency n |
Collector type |
Century Sun |
0.696 |
0.4 |
0.015 |
50 |
800 |
0.624 |
TUBE U PIPE |
CHANGZHOU CONS*** |
0.483 |
1.83 |
1.585 |
50 |
800 |
0.346 |
TUBE HEAT PIPE |
JIANGSU SUNR*** |
0.65 |
1.585 |
0.002 |
50 |
800 |
0.545 |
TUBE HEAT PIPE |
JIANGSU SUNR*** |
0.734 |
1.529 |
0.0166 |
50 |
800 |
0.587 |
TUBE U PIPE |
CHINA HIM** |
0.779 |
2.103 |
0.0107 |
50 |
800 |
0.614 |
TUBE U PIPE |
APRIC** |
0.656 |
2.063 |
0.006 |
50 |
800 |
0.508 |
TUBE HEAT PIPE |
CONER** |
0.804 |
4.076 |
0.0061 |
50 |
800 |
0.530 |
FLAT PANEL |
RITT** SOLAR |
0.642 |
0.885 |
0.01 |
50 |
800 |
0.584 |
TUBE U PIPE |
ZHEJIANG SHENTA** |
0.679 |
1.696 |
0.0099 |
50 |
800 |
0.542 |
TUBE HEAT PIPE |
ABOVE DATA IS GIVEN TO APERATURE AREA.
Tm-Ta: Difference between collector out let and in let
temperature. Here we give value of 50 which is the normal
temperature you require your collector to rise. G: The
amount of solar energy which hits your collector absorbing
element a1, a2:1st and 2nd ORDER heat loss of your
collector and the smaller value is the better performance your
collector has. Above TABLE gives you a comparison between
efficiencies of different collectors when you want your
collector to rise your cold water temperature by 50
degree.
COST COMPARASION
|
Aperture Area |
h0 |
a1 |
a2 |
Solar isolation kWh |
Result kWh |
Cost |
Cost/kwh |
AKU |
1 |
0.696 |
0.4 |
0.015 |
1000 |
662 |
100 |
0.15 |
CHINA HIM** |
1 |
0.779 |
2.103 |
0.0107 |
1000 |
614 |
100 |
0.16 |
JIANGSU SUNR*** |
1 |
0.734 |
1.529 |
0.0166 |
1000 |
587 |
100 |
0.17 |
RITT** SOLAR |
1 |
0.642 |
0.885 |
0.01 |
1000 |
584 |
100 |
0.17 |
JIANGSU SUNR*** |
1 |
0.65 |
1.585 |
0.002 |
1000 |
545 |
100 |
0.18 |
ZHEJIANG SHENT** |
1 |
0.679 |
1.696 |
0.0099 |
1000 |
542 |
100 |
0.18 |
CONER** |
1 |
0.804 |
4.076 |
0.0061 |
1000 |
530 |
100 |
0.19 |
APRIC** |
1 |
0.656 |
2.063 |
0.006 |
1000 |
508 |
100 |
0.20 |
CHANGZHOU CONS*** |
1 |
0.483 |
1.83 |
1.585 |
1000 |
346 |
100 |
0.29 |
If all above collectors are sold at same price, you
pay least for per KW out put FROM AKU collector.
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